release branch: Fix: --enable-werror

release branch: Fix: --enable-werror

gdb-8.0-branch
./configure --enable-werror --enable-targets=all
aarch64-tdep.c:3045:13: error: ‘void selftests::aarch64_process_record_test()’ declared ‘static’ but never defined [-Werror=unused-function]
arm-tdep.c:9601:13: error: ‘void selftests::arm_record_test()’ declared ‘static’ but never defined [-Werror=unused-function]

gdb/ChangeLog
2017-04-21  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* aarch64-tdep.c (selftests::aarch64_process_record_test): Make it #if
	GDB_SELF_TEST.
	* arm-tdep.c (selftests::arm_record_test): Likewise.